Aggregate data is a data ‘summary’ where the values of a number of rows are grouped together to form a single value, such as e.g. an average salary per department, or a sum of all sales across a category. Aggregate data is also often used in machine learning models.
Since they don’t identify any one individual, such data aggregates may at first sight look safe to publish. But statistical summaries can be vulnerable to reconstruction or differencing attacks, which allow an attacker to identify individuals by making multiple queries.
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